A standard procedure for implementation and automatic correction of LCC matching networks

A characteristic feature of most Magnetic Particle Imaging and Spectrometry systems is the field generator, an electromagnetic coil that produces the excitation field, which in turn forces the magnetic nanoparticles to produce their unique fingerprint used in imaging and spectrometry. Effective power transfer from the power source to the field generator usually demands for an impedance matching network. Due to component tolerances or environmental conditions, implementation of such an impedance matching can be tedious. Additionally, the impedance matching might change under working conditions caused by e.g. heating of the components and the resulting change in their electrical properties. This contribution aims to firstly present a standard procedure for implementation of an impedance matching network, addressing the difficulties arising from imprecise component values, and secondly a concept for automatic impedance correction if the electrical properties of system components change. To achieve those objectives, it is exploited that the conductance of the matching network is invariant under a change of the parallel capacitance.